The final boss was Josh's version of the other bosses, it just represents his death. As for his body falling out, that was Alex coming to terms with what happened rather than running away. thats what...

Tooie is far superior to Kazooie, though I like Kazooie more. The reason may be it's darker tone. It's nowhere near as bright and cheery as Kazooie. I remember liking Tooie more when I was a kid but...

It might be just me but, Tooie is more complex than Kazooie, with bigger levels, new moves, more variety, etc. And this difference makes Tooie harder than Kazooie. Kazooie is really straightforward....